Wuhan Guide IR136 Bedienungsanleitung PDF herunterladen (Seite 87)

Thermografie in der Theorie und Praxis (INTERNET: www.irPOD.net / e-MAIL: [email protected] ) © Bernd Schindel 2007

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Undershoot

The amount that a cooling cycle in a thermal feedback control system cools beyond the set point.

Valence Band

The energy level which contains molecularly bound electrons which can not move within the crystal lattice.

For there to be conduction in a semi-conductor, valence electrons much be stimulated to overcome the

energy gap and enter the conductance band.

View Factor

A factor which adjusts the radiant energy transfer values between two objects based on their relative

surface geometry.

Viewfinder

A small display attached to a camera (or IR sensor) for aiding the operator in adjusting the location and

display characteristics of the equipment. A viewfinder reproduces the finally system display at a reduced

size and resolution, usually in black and white to help with adjustments.

(Infrared) Viewer

A class of remote infrared sensing equipment. This class of-equipment creates an image of relative

radiation levels but does not allow any direct readout of intensity values. This kind of equipment is quite

useful for police, fire, and security use. Viewers have been used effectively for many years in the qualitative

analysis of maintenance inspections.

Void (thermal)

An area in a surface which displays significantly different thermal impedance from adjacent areas. This can

be due to a different object internal -structure - such as an insulation void in the wall of a building.

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Wuhan Guide IR136 Bedienungsanleitung Seite 87